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SUMMARY:SwissMech: The birth and death of buoyant hydraulic fractures
DTSTART:20220414T160000
DTEND:20220414T170000
DTSTAMP:20260916T212131Z
UID:13c15b679a53bfb5ea3da03e0b6e8d5b3016a736f413a553b0c63a63
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Brice Lecampion\n\nGeo-Energy Lab – Gaznat Chair on Ge
 oEnergy\, EPFL Lausanne\nAbstract: Propagation of tensile fractures ubiqui
 tously occurs at depth in the upper earth crust due to fluid pressurizatio
 n associated either with natural causes (magma overpressure\, dehydration 
 reaction in subduction zones\, hydrothermal systems etc.) or direct anthro
 pogenic fluid injection (well stimulation for hydrocarbons or geothermal f
 luids production). The growth of such fluid-driven fractures in a solid un
 der pre-existing compressive stresses is governed by the coupling between 
 lubrication flow inside the growing fracture and linear elastic fracture m
 echanics of the solid. In nature\, the initial stress field becomes more c
 ompressive with depth\, leading to a buoyancy force generated by the diffe
 rence between the vertical gradient of the minimum stress (acting perpendi
 cular to the fracture plane) and the fluid weight. Once the fracture grows
  beyond a critical length scale\, this buoyancy force strongly affects its
  propagation. In particular\, the ratio between the energy dissipated by v
 iscous flow and fracture surfaces creation sets the dynamics and elongatio
 n of such three-dimensional buoyant fractures. The expectancy and variety 
 of shapes of these fractures will be illustrated in the light of typical m
 aterial and injection parameters encountered in nature\, engineering appli
 cations and laboratory experiments. Finally\, we will explore how typical 
 variation of in-situ stress and material properties at depth can stop the 
 other-wise self-sustained growth of these fractures.\n\nOnline\nMeeting ID
 : 948 1780 9233\nPassword: 294006\n\n 
LOCATION:https://ethz.zoom.us/j/94817809233?pwd=N0pzbnQwSFFTQnVPcVR3SkNrd2
 9OQT09
STATUS:CONFIRMED
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